"Can I change root's email address or forward all mail to an external address?" suggested in the box on top did not help me. It suggests creating files in each users home directory. I want a catch all which works even if the user does not have a home directory. I'll check the other suggestions here in the comments. Thanks for trying to help me!
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DeletedSep 4 '13 at 20:11

@sim: That suggests using esmtp, which I don't want to use. But thanks for trying to help!
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DeletedSep 4 '13 at 20:13

Look at the possible duplicate one. That showed how to use the /etc/aliases file to setup forwarding.
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slm♦Sep 4 '13 at 20:16